21525505430 has 32 divisors (see below), whose sum is σ = 45519673248. Its totient is φ = 7225344000.

The previous prime is 21525505423. The next prime is 21525505447. The reversal of 21525505430 is 3450552512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7524971 + ... + 7527830.

It is an arithmetic number, because the mean of its divisors is an integer number (1422489789).

Almost surely, 2^21525505430 is an apocalyptic number.

21525505430 is an abundant number, since it is smaller than the sum of its proper divisors (23994167818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21525505430 is a wasteful number, since it uses less digits than its factorization.

21525505430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15052832.

The product of its (nonzero) digits is 30000, while the sum is 32.

The spelling of 21525505430 in words is "twenty-one billion, five hundred twenty-five million, five hundred five thousand, four hundred thirty".